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Tracking Visual Events in Time in the Absence of Time Perception: Implicit Processing at the ms Level
Patrick Eric Poncelet1, Anne Giersch1
1INSERM U1114, Department of Psychiatry, Fédération de Médecine Translationnelle de Strasbourg, Strasbourg University Hospital, Strasbourg, France.
Plos One
|June 2, 2015
Summary
Our study shows that the brain processes visual stimuli presented very close in time, even when perceived as simultaneous. This processing influences our perception of temporal order and continuity.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Psychophysics
Background:
- Explicit judgments of simultaneity often fail to capture implicit temporal discrimination.
- Understanding how the brain encodes information within very short timescales (<20 ms) remains a challenge.
Purpose of the Study:
- To investigate the temporal processing of successive visual stimuli within 20 ms using a priming paradigm.
- To determine how information is encoded and influences perception at these rapid timescales.
Main Methods:
- Employed a priming paradigm with two square frame primers presented simultaneously or with 17 ms asynchrony.
- Primers were followed by target stimuli after delays of 25-100 ms.
- Subjects performed tasks involving identifying the location of filled-in frames, assessing response times and biases.
Main Results:
- Faster response times were observed, influenced by primer location, particularly at longer primer-target delays (75-100 ms).
- The observed bias towards the second primer was largely independent of task context and response hand.
- Results suggest a potential role for attentional displacement in processing rapid successive stimuli.
Conclusions:
- The brain efficiently processes the flow of events even at sub-20 ms intervals, exceeding capabilities suggested by explicit simultaneity judgments.
- Findings contribute to understanding temporal continuity perception and rapid visual information encoding.
